How far should couples go?

I am BI and my girlfriend loves hearing about my past but hates thinking of 3 ways or exploring her own sexuality. We are currently in a long distance relationship due to my change of orders in the military. I have been encouraging her to try to have sex (with other people) or be outgoing but she hates the idea. What are the bounds of a relationship or are they different for every situation?
How far should couples go?
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